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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd53b20871f554701bb99a817dbe7b373f1facbea5b516cc1c257f3f03fb0e24c' 
  AND token = 'w96TI4zLIkbd3uQjTwoQVIFBk70pUTdCL3tA4SgryI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}